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[NFC][InstSimplify] Add extra test for D67411 with @llvm.assume 

llvm-svn: 371629
This commit is contained in:
Roman Lebedev 2019-09-11 15:28:03 +00:00
parent 161cca266a
commit 8aeb7bb013
1 changed files with 21 additions and 0 deletions
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21
llvm/test/Transforms/InstSimplify/redundant-null-check-in-uadd_with_overflow-of-nonnull-ptr.ll
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@ -244,3 +244,24 @@ define i1 @t15(i8* nonnull %base, i64 %offset) {
%res = and i1 %no_overflow_during_adjustment, %non_null_after_adjustment ; swapped
ret i1 %res
}
declare void @llvm.assume(i1)
define i1 @t16(i64 %base, i64 %offset) {
; CHECK-LABEL: @t16(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i64 [[BASE:%.*]], 0
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = add i64 [[BASE]], [[OFFSET:%.*]]
; CHECK-NEXT: [[NON_NULL_AFTER_ADJUSTMENT:%.*]] = icmp ne i64 [[ADJUSTED]], 0
; CHECK-NEXT: [[NO_OVERFLOW_DURING_ADJUSTMENT:%.*]] = icmp uge i64 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: [[RES:%.*]] = and i1 [[NON_NULL_AFTER_ADJUSTMENT]], [[NO_OVERFLOW_DURING_ADJUSTMENT]]
; CHECK-NEXT: ret i1 [[RES]]
;
%cmp = icmp slt i64 %base, 0
call void @llvm.assume(i1 %cmp)
%adjusted = add i64 %base, %offset
%non_null_after_adjustment = icmp ne i64 %adjusted, 0
%no_overflow_during_adjustment = icmp uge i64 %adjusted, %base
%res = and i1 %non_null_after_adjustment, %no_overflow_during_adjustment
ret i1 %res
}